Barthel erbe



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Letters Patent No. 77,966, datedMag/ 19,1868; antedated Mey 12, 1868.

IMPROVEMENT REVERSIBLE KNOB-LATGHBS.

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Be it known that :'I, BARTHEL ERBE, of the borough of'Birmingham, Allegheny county, State of Pennsyl-` Vania, have invented a certain new and useful Improvement in theManner of Constructing Revel-sible Right and Left-HandDoor-Iiatches; and I hereby declare that the following is a full, clear, and exact description of the sam-e, reference beinghad to the accompanying drawings, which form part of this specifica-tion, andto the letters of explanation marked thereon. 4

i My invention relates to that class of reversible latches in which the latch has a supplemental motion in the case, so as to permit the head o f the latch .being drawn out of the case, so that it .may b e reversed without dis` connecting it from'its internal attachments. In the drawings- Figure 1 exhibits interior of a door-lock, embodying my improvement in position aswwhcn in use.

Figure'2 exhibits the `same when iu process of being` reversed.

Figure 3 is a separate View of the slidin'g frame or yolre. i Eigure 4 is a separate view of the latch which operates in eonnectionwith-g. 3, beingl connected therewith at the swivel-bearing g, as shown in figs. I and-2, and in which bearing g` the latch turns freely. When at rest,v the' latch isV drawn into its proper position as in iig. 1, by theV-a'etion ofthe spiral 'spring s, figs. 1, 2, and 3.V 'Herietofore the latch and yoke have been used withoutother connectionfor attachment `than this swivel-bearing and spring, but it has'been found not reliable, for it frequently lhappens that the friction of the keeper or other parts'in'oontact with the latch is suicientto compress the spring s, and prevent the'proper action ofthe latchl whenbeing drawn into the case 'to .permit the opening of the door.

l To obviate `this diculty, I form the yoke with the projecting hook and the forward end of the latch with the depression Z, into which the hook-1t falls, asseen in fig. 1. I place the screw-hole 1* yin such relation ne the hook n, thatlwhen a screw is inserted through this hole, the hook cannot be withdrawn froui'depresson l in the latch,

off the spring si when the latch is operated. x

The hook nand the rear end of the depression-Z, at m, are bevelled as shown, so that when relieved of restraint by the absence of the screw from r, asIight strain is sullcient to withdraw the square end ofthe latch entirely out of' the oase, as shown in fig'. 2, when it may be readily revolvedon its axis, and adapted t6 a right or left` and-the yolre and latch are securely and rigidly held in' the position shown in iig. 1, and Vall strain `is taken v hand door, as is desired.

Having thus described my in'zprovement, and its mode of operation, and advantages, I claim as my invention, and desire to secure by Letters Patent The hook it, in combination with the depression l on th'e latch, arrangedV and operating as*` described, for i,

the'purpose set forth. BARTHEL ERBE Witnesses: l

.Y A. S. NmHQLsoN, i, JAs. RICHARDSON. 

